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1da177e4 LT |
1 | /* |
2 | * arch/sh/mm/tlb-sh4.c | |
3 | * | |
4 | * SH-4 specific TLB operations | |
5 | * | |
6 | * Copyright (C) 1999 Niibe Yutaka | |
7 | * Copyright (C) 2002 Paul Mundt | |
8 | * | |
9 | * Released under the terms of the GNU GPL v2.0. | |
10 | */ | |
39e688a9 PM |
11 | #include <linux/signal.h> |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/interrupt.h> | |
23 | ||
1da177e4 | 24 | #include <asm/system.h> |
39e688a9 PM |
25 | #include <asm/io.h> |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/pgalloc.h> | |
1da177e4 | 28 | #include <asm/mmu_context.h> |
39e688a9 PM |
29 | #include <asm/cacheflush.h> |
30 | ||
31 | void update_mmu_cache(struct vm_area_struct * vma, | |
32 | unsigned long address, pte_t pte) | |
33 | { | |
34 | unsigned long flags; | |
35 | unsigned long pteval; | |
36 | unsigned long vpn; | |
37 | struct page *page; | |
38 | unsigned long pfn; | |
39 | ||
40 | /* Ptrace may call this routine. */ | |
41 | if (vma && current->active_mm != vma->vm_mm) | |
42 | return; | |
43 | ||
44 | pfn = pte_pfn(pte); | |
45 | if (pfn_valid(pfn)) { | |
46 | page = pfn_to_page(pfn); | |
47 | if (!test_bit(PG_mapped, &page->flags)) { | |
48 | unsigned long phys = pte_val(pte) & PTE_PHYS_MASK; | |
49 | __flush_wback_region((void *)P1SEGADDR(phys), PAGE_SIZE); | |
50 | __set_bit(PG_mapped, &page->flags); | |
51 | } | |
52 | } | |
53 | ||
54 | local_irq_save(flags); | |
55 | ||
56 | /* Set PTEH register */ | |
57 | vpn = (address & MMU_VPN_MASK) | get_asid(); | |
58 | ctrl_outl(vpn, MMU_PTEH); | |
59 | ||
60 | pteval = pte_val(pte); | |
61 | ||
62 | /* Set PTEA register */ | |
63 | if (cpu_data->flags & CPU_HAS_PTEA) | |
64 | /* TODO: make this look less hacky */ | |
65 | ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA); | |
66 | ||
67 | /* Set PTEL register */ | |
68 | pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */ | |
69 | #ifdef CONFIG_SH_WRITETHROUGH | |
70 | pteval |= _PAGE_WT; | |
71 | #endif | |
72 | /* conveniently, we want all the software flags to be 0 anyway */ | |
73 | ctrl_outl(pteval, MMU_PTEL); | |
74 | ||
75 | /* Load the TLB */ | |
76 | asm volatile("ldtlb": /* no output */ : /* no input */ : "memory"); | |
77 | local_irq_restore(flags); | |
78 | } | |
1da177e4 | 79 | |
ea9af694 | 80 | void local_flush_tlb_one(unsigned long asid, unsigned long page) |
1da177e4 LT |
81 | { |
82 | unsigned long addr, data; | |
83 | ||
84 | /* | |
85 | * NOTE: PTEH.ASID should be set to this MM | |
86 | * _AND_ we need to write ASID to the array. | |
87 | * | |
88 | * It would be simple if we didn't need to set PTEH.ASID... | |
89 | */ | |
90 | addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT; | |
91 | data = page | asid; /* VALID bit is off */ | |
92 | jump_to_P2(); | |
93 | ctrl_outl(data, addr); | |
94 | back_to_P1(); | |
95 | } | |
39e688a9 | 96 |